20GR1052 / PHILIPS [TV 51 (47/48) cm picture]

• Poor sync. AGC fault.
• No tuning, no remote volume control. (with circuit diagram extract)
• Buzzing.
• The TV cannot hold the picture.
• No output from the chopper power supply which uses a junction FET, whose gate and source are at 12V while 300V is present at the drain. (part of circuit diagram displayed)
• Defective purity.
• Slow start-up.
• No audio. (service info for PHILIPS -20GR1052)
• Reluctant to start from cold (picture attached)
• New infra red receiver. (20GR1052 PHILIPS repair tip)
• No colour.
• Bright flash on screen. No picture or sound. (extract of circuit diagram attached)
• No audio.
• Comes on for a short time. (PHILIPS - 20GR1052 information)
• "Store" key does not work. (picture attached)
• Stuck in hotel mode.
• Line output stage TS7528 is defective. (with circuit diagram extract)
• No functions. Standby LED flashes. Relay switches to ON.
• Reduced vertical size. at top.
• Reduced horizontal size. (part of circuit diagram displayed)
• The TV does not stop during the tuning phase.
• Colours flicker and disappears.
• Colour flickers. No colour. after a while. (part of circuit diagram displayed)
• Change of C2523.
• No tuning. No channel lock. (+ extract of circuit diagram)
• Change of C2523.
• Picture is faint with hanover bars. (part of circuit diagram displayed)
• How to de-activate volume limiter. (PHILIPS - 20GR1052 information)
• Stuck in standby. (+ extract of circuit diagram)
• Vertical amplitude cannot be fully adjusted, TXT lines can be seen. (picture attached)
• Programme tuning difficulty. Stations has shifted on tuning bar.
• During picture changes sometimes a volume increase (plop) is heard. (with circuit diagram extract) (20GR1052 PHILIPS repair tip)
• Will not tune, drifts, colour disappears or interference on a certain channel. (e.g. channel 5 and 59)
• Line output transistor fails repeatedly. (+ extract of circuit diagram)
• Picture shifted to the left. intermittently. Line tearing. intermittently. (part of circuit diagram displayed)
• How to de-activate Hotel-Mode:
• No channel search. No OSD. (with circuit diagram extract) (20GR1052 tips)
• Right side of picture discoloured.
• White screen with flyback lines. Excessive brightness which increases until PSU switches to protection mode. (part of circuit diagram displayed)
• Picture shifted to the right. (part of circuit diagram displayed)
• Does not regulate +95V.
• No functions. Hum in loudspeaker. No LED lit.
• Standby just pulsing.
• No picture, only squeaks for a short time at switch on then no more functions.
• Power supply does not oscillate. (extract of circuit diagram attached)
• Only half a picture. (+ extract of circuit diagram)
• Volume can't be tuned down. No tuning with RC. (extract of circuit diagram attached)
• Very slight vertical foldover with interferences similar to EHT arcing, especially on very white scenes.
• No function. Standby-LED lights up. Appliance switches on but no picture or sound.
• No picture or sound but RCU works correctly. LED flashes when the handset is tried. (extract of circuit diagram attached)
• Initial volume level is higher than maximum hotel mode setting.
• Horizontal hold adjustment procedure.
• Line transistor 7528 blows within 1 sec. (part of circuit diagram displayed)
• Programme tuning difficulty, stations shifted on tuning bar. (+ extract of circuit diagram)
• Blank raster. OSD OK . (PHILIPS - 20GR1052 information)
• After switching on the CTV "EXT...1.2.3..." appears on the screen.
• Excessive vertical size.
• No tuning.
• Unstable tuning.
• Green screen and at other times no tuning. (extract of circuit diagram attached)
• How to switch OFF Hotel-Mode.
• Stations won't change. Picture and sound OK. Other functions OK.
• No tuning. only on certain channels.
• Dead. Power LED is OFF (ON in standby). Hissing from PSU.
• Vertical collapse. (picture attached)
• Standby LED lights up and switches off at power on. Appliance will not start up.
• Tuning menu can not be called. All other functions OK.
• No start up, just a buzzing noise in speakers. (part of circuit diagram displayed)
• Line tearing. on lower half screen. (extract of circuit diagram attached)
• Intermittent colour.
• Colour amplitude and phase adjustment procedure.
• 10V on 95V line. (picture attached)
• Comes on in standby. When program button pressed standby lamp blinks then goes off.
• Dim picture with Hanover bars.
• Search jumps on UHF.
• Identification coil adjustment.
• +B very high. (picture attached)
• 6613 type change. (extract of circuit diagram attached)
• Intermittently dead. (part of circuit diagram displayed) (20GR1052 PHILIPS repair tip)
• The following production changes were introduced to prevent the set coming on in the store lock mode when switched on from standby. (with circuit diagram extract)
• Spurious nonsense OSG. Goes to standby after 0.5-2hrs. Loss of tuning.
• Set comes on in store lock mode. (picture attached)
• Random breakdown of line output transistor. (picture attached)
• No sound. Picture OK. After a short time TV stops. High frequency noise from PSU. (with circuit diagram extract)
• Dead when switched on via mains switch. Though appliance is on, red LED flashes. Can be switched over to standby. If left in standby for 1 hour and then switched on via RC, functions.
• No picture. OSD OK .
• Error messages indicated by front display flashing. (extract of circuit diagram attached)
• Local controls inoperative. (20GR1052 tips)
• Volume change with great fluctuations in brightness. (extract of circuit diagram attached)
• Dead. Low frequency noise on sound.
• White unmodulated raster. Picture missing. (with circuit diagram extract)
• Low frequency noise on sound.
• No freeze frame or intermittent freeze frame; no sound. (with circuit diagram extract)
• Excessive HV. after a while.
• Hazy flickering picture at top. (extract of circuit diagram attached)
• No colour. (part of circuit diagram displayed)
• No start-up. Buzzing from speakers and working noise of PSU.
• Excessive horizontal size.
• No functions, hum in loudspeakers. (+ extract of circuit diagram)
• Replacement of surface mounted diode 6637. (with circuit diagram extract)
• Line down middle of screen. (+ extract of circuit diagram)
• Excessive green.
• Buzzing sound then switches off.
• Picture is poor with rippling on verticals. (extract of circuit diagram attached)
• Replacement of TDA7052 with a TDA7052A.
• Does not start up. Light buzz from loudspeaker. Standby LED produces one brief blink.
• Unstable tuning.
• Enable Hotel mode. (service info for PHILIPS -20GR1052)
• Two lines going around. (+ extract of circuit diagram)
• Settings do not stay in position.
• No vertical deflection. (+ extract of circuit diagram)
• Store lock on the appliance.
• No start-up. intermittently.
• Programs and PP-settings cannot be changed. (service info for PHILIPS -20GR1052)
• Sound motorboating when cold. (picture attached)
• Dead, very slight whistle from PSU.
• Dead. At switch on the stand by LED flashes.
• No sound. No picture. Faint motorboating noise.
• No start-up. intermittently (when cold). (part of circuit diagram displayed)
• The switched-mode power supply cannot be loaded.
• Sound varies with picture content.
• To put into hotel mode.
• Whistling from PSU. (picture attached)
• Only some programs with snowy picture can be tuned and on band 1 missing some programs. (picture attached)
• Line output transistor running hot. (part of circuit diagram displayed) (PHILIPS - 20GR1052 information)
• Appliance does not function with standby light flashing.
• No picture. (extract of circuit diagram attached)
• Doesn't store stations correctly. (PHILIPS - 20GR1052 information)
• Picture shifts. (+ extract of circuit diagram)
• No picture. No audio. (picture attached)
• Green picture with retrace lines. After a few restarts picture OK.
• Appliance hums slightly (no speaker) horizontal end stage and power supply transistor are ok. Unfortunately no service instructions available.
• Dead set. Tries to start.
• No start-up. (part of circuit diagram displayed)
• Programme channel search cannot be called up.
• Colour sync adjustment procedure.
• SIF DET adjustment procedure.
• Set goes accidentally into hotel mode.
• Frame has shifted sideways. Appliance whistles and does not oscillate correctly. (extract of circuit diagram attached)
• Sometimes when turned on, green screen only with flyback lines, at other times no tuning and channel will not change. (with circuit diagram extract)
• Blank raster. Flyback lines. (+ extract of circuit diagram)
• Dead. Strange noises from PSU/ line output transformer. (part of circuit diagram displayed)
• No picture. TXT OK . (picture attached)
• Line chirps intermittently. Appliance does not start. Only hum from loudspeakers.
• Buzz in audio (intermittently). (with circuit diagram extract)
• No HV. (20GR1052 PHILIPS repair tip)
• SOPS defective. (part of circuit diagram displayed)
• No colour.
• Modification introduced to +9V supply.
• Picture displays lines and strange foldover effect at centre.
• Unregulated power supply. Pulsating picture and surging sound. (extract of circuit diagram attached)
• Connection of a loop system to the TV.
• No audio.
• Switches off by itself. after a while. (picture attached)
• No sound or raster. The 95V HT supply is present at the line output stage but there is no line drive. (part of circuit diagram displayed)
• Picture fails for a short time. (+ extract of circuit diagram)
• Intermittent audio and picture. (extract of circuit diagram attached)
• Tuning procedure.
• Intermittent colour.
• Programming unoperational. Limited sound adjustment possible.
• Failures in the power supply. (with circuit diagram extract)
• Stops working every 2 or 3 hrs. Only starts again after switching off and on again. (PHILIPS - 20GR1052 information)
• Crackling and popping in sound after a short time.
• Power supply fault finding. (with circuit diagram extract)
• Buzzing from PSU. when cold. (picture attached)
• The picture is slightly yellow, flyback lines. Slightly noisy, no own recording possible.
• Poor synchronisation. (part of circuit diagram displayed)
• No transmitters to adjust and the sound is not controllable. (20GR1052 PHILIPS repair tip)
• Delay RF AGC adjustment procedure.
• Sound varies with picture content.
• Searches for channels continuously. (with circuit diagram extract)
• Tuning drifts. only on certain channels (after a while).
• Unable to tune or set volume in Prefix mode.
• Cannot change tuning or stored settings. (extract of circuit diagram attached)
• Does not switch on. LED is lit in standby. If appliance is switched on with RC, LED switches off.
• Field foldover at switch on from cold. Effect disappears when appliance warms up. (with circuit diagram extract)
• Tuning drifts. only on certain channels.
• Stops at start up. (+ extract of circuit diagram) (20GR1052 tips)
• PSU check.
• The removal of leaded diodes. (+ extract of circuit diagram)
• Colours flickers and disappears.
• Cannot be programmed and search does not function. Only limited volume adjustable.
• Difficult to tune programmes, stations shifted on tuning bar.
• Green screen with flyback lines. Green oscillations. Noise as if HV leaky on picture tube base. (part of circuit diagram displayed)
• No switch on. Low noise on sound. (with circuit diagram extract)
• Vertical oscillator adjustment procedure.
• Intermittent channel drift in UHF. Channel search OK. VHF OK.
• No audio.
• No operation.
• Volume goes to max. No volume control.
• Intermittent destruction of line o/p transistor. (with circuit diagram extract)
• No picture and sound. Low hum intermittently, no function.
• No colour and vertical black bar across screen.
• Picture passes out in the centre.
• No tuning. Impossible to change analog control adjustments (brightness, sound, etc.). (picture attached)
• Enter service mode.
• Processor numbers (changed).
• Green picture.
• Control micro processors.
• To improve performance with prerecorded cassettes. (extract of circuit diagram attached)
• Green picture.
• Poor synchronisation. when cold. (with circuit diagram extract)
• Strongly distorted sound by low volume.
• No function. Motorboating from PSU. TV starts up randomly. Intermittent fault.
• PSU switches off with load at U95V. (extract of circuit diagram attached)
• Won't tune a new channel. Won't activate store function. Picture OK. Sound OK.
• Dead. (picture attached)
• Set does not retune or program etc
• Noise in sound. Mute does not function.
• Vertical vibration in cold condition of set.
• Initial volume level is higher than maximum Hotel mode setting.
• No HT from chopper circuit. (picture attached) (20GR1052 PHILIPS repair tip)
• Change of C2523.
• R-Y and B-Y discriminator adjustment procedure. (+ extract of circuit diagram)
• Drive for high voltage missing. (part of circuit diagram displayed)
• High voltage transistor defective after a while.
• Appliance can not be programmed. Search does not function. Only limited volume control.
• Red picture. Flyback lines.
• Picture is mostly green with flyback lines after 10 secs from switch on.
• Dead. Only hum from speakers. (with circuit diagram extract)
• No start up. No standby. Attempts to start up, but fails. (PHILIPS - 20GR1052 information)
• No colour in OSD.
• Replacing the EAROM. (extract of circuit diagram attached)
• How to de-activate Hotel mode.
• Unable to retune set or set analogue levels. Store-lock option may be on "Hotel mode". (20GR1052 tips)
• Line tearing, especially with bright scences. (picture attached)
• No tuning bar when install button pressed and set not in hotel mode. (part of circuit diagram displayed)
• When switching on, only a 10cm stripe on top of screen, the rest of screen is black with flyback lines. After a while, stripe becomes wider. (with circuit diagram extract)
• No line output stage. (picture attached)
• Slight foldover at upper part of picture if appliance is switched on when cold. Fault disappears after few minutes. (extract of circuit diagram attached) (20GR1052 tips)
• Dead. Low level buzz from loudspeaker. (with circuit diagram extract)
• Display goes to F1 a few seconds after switching the set on. (PHILIPS - 20GR1052 information)
• Bright picture. Flyback lines.
• Low audio.
• Memory content dropout at positions 4 and 5.
• Colour disappears with VCR-scan (picture search). (+ extract of circuit diagram)
• Green raster. Faint picture. Flyback lines. (20GR1052 PHILIPS repair tip)
• No SOP supply. (part of circuit diagram displayed)
• Picture appears slowly.
• Dead. Low hum.
• 95V available. 9V is only 5.2V. Slight buzzing from loudspeakers.
• Picture only in two bars in upper screen section, the rest is dark. (picture attached)
• Excessive brightness.
• No audio.
• Dead with whistling noise coming from power supply. (extract of circuit diagram attached)
• Volume varies. depending on picture content. (extract of circuit diagram attached)
• No functions. when cold.
• Trips. (part of circuit diagram displayed)
• Tripping. (+ extract of circuit diagram)
• Memory cannot be opened via "rhombus". Stored channels cannot be changed.
• Control panel cover.
• After working normally for a while the TV blocks in any position. The functions do not work.
• How to de-activate Hotel-Mode.
• The fuse and the bridge diodes in the power supply blow.
• Intermittently narrow picture, but corrects itself shortly after.
• Intermittently no picture and sound at switch on. Buzz from speaker. (part of circuit diagram displayed)
• Lines across top of picture about 8" in first 100 lines. (+ extract of circuit diagram) (20GR1052 tip from PHILIPS)
• To release hotel mode (child lock).
• Unstable tuning.
• Microprocessor screening plate. (extract of circuit diagram attached)
• Line output stage does not start up. (extract of circuit diagram attached)
• Unstable tuning.
• Modification at line transformer position 5530. (extract of circuit diagram attached)
• Field collapse normally with blank picture. (extract of circuit diagram attached)
• Bright flash on screen and no picture or sound after a few minutes. (part of circuit diagram displayed)
• No functions. Sound buzzes in loudspeaker. (with circuit diagram extract)
• No or intermittent start-up. (picture attached)
• Occasionally appliance does not switch on from standby. No further functions are possible.
• Set won't tune to high frequency channels and lower frequency channels appear to be higher. (part of circuit diagram displayed)
• Sound increases intermittently or "pops", especially during bright scenes. (extract of circuit diagram attached)
• Adjustment of +95V. (part of circuit diagram displayed)
• Loosing colour during play-back of a video tape. (with circuit diagram extract)
• Vertical line. on the right half screen. (picture attached)
• No audio.
• Green screen with flyback line. No picture. OSD OK.
• Intermittently dead. after start-up.
• No connection for headphone.
• No function. Standby LED flashes briefly. (extract of circuit diagram attached)
• Appliance will not switch on at times, but hums in the power supply section. (PHILIPS - 20GR1052 information)
• Tuning drift, when it is hot the tuning is lost on channel change. (20GR1052 tips)
• Error codes.
• Intermittent green picture, channels cannot be programmed. (+ extract of circuit diagram)
• Search jumps on UHF.
• Vertical roll. (picture attached)
• No picture. No sound. Switching on and off from Standby OK.
• No functions. after start-up (intermittently).
• No start-up. Standby LED flashes .
• Noise in audio. (service info for PHILIPS -20GR1052)
• Does not shut down (when cold).
• Dark picture.
• No horizontal synchronisation. (part of circuit diagram displayed)
• No colour.
• Line tearing and rope effect.
• Height excessive. Defective linearity. Field blanking. (extract of circuit diagram attached)
• Interference in audio. Interference in picture. (picture attached)
• Distorted audio.
• Dark picture. Audio OK .
• Green picture after few hours, intermittently fault disappears for short while when switching from a station to another. Strange characters in OSD.
• Does not stop on stations.
• No picture, sound ok but on turning up A1 control, frame collapse. (with circuit diagram extract)
• Memory loss. (extract of circuit diagram attached)
• The remote control only controls the volume and sound-stop. No function with On-Off and channel change-over, although the display for the operation flickers.
• No power supply start up in loaded condition (eg. with lamp).
• Sound varies with picture content.
• Switches to standby. (with circuit diagram extract)
• Does not start. Slight buzzing in loudspeaker.
• Enable Hotel mode. Disable hotel mode.
• No audio.
• To remove store/lock.
• Doesn't tune stations correctly. When cold, crossed lines on low UHF channels. (part of circuit diagram displayed)
• V-centre adjustment procedure.
• Low audio. (extract of circuit diagram attached)
• Slow hiccup (extract of circuit diagram attached)
• Limited volume. No channel search.
• Chopper inoperative. (extract of circuit diagram attached)
• PSU does not start up, if appliance was switched off for a day. Appliance functions after short switch on/off. (part of circuit diagram displayed)
• Becomes defective immediately after switch on.
• Reluctant to start up from cold. (service info for PHILIPS -20GR1052)
• Defective IC7103 SV-production. (part of circuit diagram displayed)
• No line output.
• Blank raster. No audio. after a while. (with circuit diagram extract)
• Picture shifted horizontally. (+ extract of circuit diagram)
• Trips. at start-up (intermittently). (part of circuit diagram displayed)
• No switch on after activating mains switch. Whistling noise. (with circuit diagram extract)
• Appliance is dead with standby LED flashing after a few seconds. (extract of circuit diagram attached)
• No regulation. (extract of circuit diagram attached)
• How to enter/exit HOTEL mode.
• Humming, motor noise and other unusual noises. Normal picture. (service info for PHILIPS -20GR1052)
• Initial volume level is higher than maximum Hotel mode setting.
• Dead due to action of over voltage protection circuit.
• After replacement of the line output transistor BUT12, picture with trapezoid effect, BUT12 overheats and goes defective again. (extract of circuit diagram attached)
• Buzz in audio. No picture.
• Vertical size varies. intermittently.
• No start up from cold and humming.
• Wavy picture. on the right.
• +9V supply modification. (extract of circuit diagram attached)
• No voltage from PSU, computer does not work. (picture attached)
• Hums softly. (part of circuit diagram displayed)
• Dead. Only standby-LED works. Responds to TURN ON command, but no image and no sound. (service info for PHILIPS -20GR1052)
• No power with abnormal sound. (with circuit diagram extract)
• Skips channels during tuning. only on certain channels.
• Green picture. (part of circuit diagram displayed)
• Turns on automatically. No RC or front panel controls.
• Stored channels drift off tune briefly after switch on. Crackle in sound.
• No frame or short frame. (part of circuit diagram displayed)
• Does not start up at once from cold. (20GR1052 tips)
• CRT types.
• No functions. Slow start-up. (with circuit diagram extract)
• Line output transistor TR7528 fails at switch on.
• White balance adjustment.
• Blue picture. Coloured lines.
• Bell filter adjustment procedure.
• Hotel mode.
• LED switches on then off immediately.
• No switch on. Weak whistling noise from PSU. LED is OFF.
• Fizzling sound from speakers at start-up and intermittently picture jagged.
• Smeary, washed out picture with bent verticals. (+ extract of circuit diagram)
• No +9V, line output stage is OK. (+ extract of circuit diagram)
• Poor reproduction of copy protected tapes. (with circuit diagram extract)
• LED does not flash. Slight buzz in appliance. (picture attached)
• Stored channels are partially lost.
• Sound returns gradually after channel change. (part of circuit diagram displayed) (service info for PHILIPS -20GR1052)
• U743 tuner replacement. (with circuit diagram extract)
• Intermittent colour and intermittent dark vertical bar on picture.
• Hotel Mode activates by itself. (extract of circuit diagram attached)
• How to reset microprocessor.
• Whistle.
• No OSD. Picture OK .
• Whistling. (20GR1052 tip from PHILIPS)
• Right hand side of screen has a line.
• Streaks in picture. Picture pulls and rolls intermittently.
• Loud chriping after switch on. It becomes lower after a short time.
• No picture. Audio OK .
• Change of C2523.
• Dim picture with Hanover bars visible. (+ extract of circuit diagram)
• Horizontal oscillator adjustment procedure.
• Description of SMPS. (+ extract of circuit diagram)
• Quick hiccup. (extract of circuit diagram attached)
• Blank or green raster. Flyback lines. Faint picture or normal picture. (with circuit diagram extract)
• Sound varies with picture content.
• Automatic fine tuning (AFT) field alignment procedure.
• Microcomputers and screening plate.
• LED flashes once, then gurgles. (with circuit diagram extract)
• PSU peeps +95 is ca 0,8v
• Line output stage does not function.
• Tuning drifts. (picture attached)
• Line output stage only starts up for a short time. (with circuit diagram extract)
• Line output transistor becomes warm and in the course of time it becomes defective. (extract of circuit diagram attached)
• No function. When switching on with RC, standby LED lights up. (+ extract of circuit diagram) (service info for PHILIPS -20GR1052)
• Blown chopper. (with circuit diagram extract)
• No sound or picture. Low hum from speaker. (picture attached)
• Colours flickers and disappears.
• No tuning possible, F2 appears on bottom of picture and S1 on top.
• Sound goes to max. intermittently and HT varies. (picture attached)
• Initial volume level is higher than maximum Hotel mode setting.
• PAL colour amplitude adjustment procedure.
• No tuning. (part of circuit diagram displayed)
• After operating for one hour it is no longer possible to switch over programmes not even from the front panel. Appliance must be switched on and off then it is possible to change channels.
• The tone (sound) tunes well, but the volume cannot be raised.
• No start-up. when cold. (picture attached) (20GR1052 tips)
• No function, starts up from standby, then goes out.
• Difficult startup. Rattling sound from line output trafo.
• No tuning - no channels.
• Production change to line drive. (picture attached)
• Initial volume level is higher than maximum Hotel mode setting.
• Green picture. after warm-up. Lines in picture. after warm-up. Does not change channels.
• Menu rolling. (with circuit diagram extract)
• Horizontal white line.
• Using a lamp as a load.
• Set dead with just 5V on the 95V line. Standby LED is on but set won't start. (picture attached)
• Protection device (thyristor THY6641) is triggered at switch on. (with circuit diagram extract) (20GR1052 tip from PHILIPS)
• No picture (when cold).
• Print with linearity coil pos. 5800.
• Skips channels during tuning. (+ extract of circuit diagram) (PHILIPS - 20GR1052 information)
• How to switch off Hotel-Mode:
• No tuning or on screen tuning display.
• No voltage from PSU. (with circuit diagram extract)
• Does not switch on, standby LED OK.
• Line out of phase. Black band in centre of screen. No colour.
• Slow start up of power supply. (picture attached)
• Focus adjustment.
• Rolling or jittering picture. (extract of circuit diagram attached)
• Service manual correction. (picture attached)
• Squealing from PSU.
• Picture separating line appears. Whistling. (service info for PHILIPS -20GR1052)
• Intermittent colour.
• Search jumps on UHF.
• New IR receiver.
• Lines on picture after approx one hour. It consists of a band of bright white lines about two inches wide. (part of circuit diagram displayed)
• No line start up; +95 available; +9V is about 4.5V. (part of circuit diagram displayed)
• Difficultly in tuning to correct position.
• How to switch off Hotel-Mode.
• No function at switch on from standby. Switches to LOCK (hotel) mode. (with circuit diagram extract) (20GR1052 PHILIPS repair tip)
• Secondary main power supply OK except +9V at 5.8V
• No standby, humming and standby LED blinks.
• Line output transistor replacement.
• No picture. No sound. Purring sound in loudspeaker. (picture attached)
• Correction to service manual LOT winding.
• Poor sound, cannot be adjusted louder. When adjusting, sound cuts out. (+ extract of circuit diagram)
• Picture centering has shifted horizontally. No OSD.
• Change of C2523. (20GR1052 tip from PHILIPS)
• Low 5V to micro chip. (part of circuit diagram displayed)